Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 21, 2017 | Supplemental Material + Published
Journal Article Open

Dynamically controlled Purcell enhancement of visible spontaneous emission in a gated plasmonic heterostructure


Emission control of colloidal quantum dots (QDs) is a cornerstone of modern high-quality lighting and display technologies. Dynamic emission control of colloidal QDs in an optoelectronic device is usually achieved by changing the optical pump intensity or injection current density. Here we propose and demonstrate a distinctly different mechanism for the temporal modulation of QD emission intensity at constant optical pumping rate. Our mechanism is based on the electrically controlled modulation of the local density of optical states (LDOS) at the position of the QDs, resulting in the modulation of the QD spontaneous emission rate, far-field emission intensity, and quantum yield. We manipulate the LDOS via field effect-induced optical permittivity modulation of an ultrathin titanium nitride (TiN) film, which is incorporated in a gated TiN/SiO_2/Ag plasmonic heterostructure. The demonstrated electrical control of the colloidal QD emission provides a new approach for modulating intensity of light in displays and other optoelectronics.

Additional Information

© 2017 The Authors. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received: 13 April 2017; Accepted: 20 October 2017; Published online: 21 November 2017. This work was supported by Samsung Electronics, the Air Force Office of Scientific Research under grant number FA9550-16-1-0019 (device-related work), and the Department of Energy under grant number DE-FG02-07ER46405 (transparent conductor-related work). We also acknowledge use of facilities supported by the Kavli Nanoscience Institute (KNI) and the Joint Center for Artificial Photosynthesis (JCAP) at Caltech. Y.-J.L. acknowledges the support from Ministry of Science and Technology, Taiwan (Grant numbers: 104-2917-I-564-057). The authors would like to thank Wei-Hsiang Lin, Anya Mitskovets, and Panos Patsalas for useful discussions. The authors gratefully acknowledge Erin Burkett from the Hixon Writing Center at Caltech for providing feedback and guidance on writing during the revision process. The authors also deeply appreciate help in the form of the close reading of the manuscript and review responses by Kelly Mauser, Dagny Fleischman, Rebecca Glaudell, Haley Bauser, Cora Went, Phil Jahelka, and Michael Kelzenberg. Contributions: Y.-J.L., R.S. and H.A.A. proposed the original idea. Y.-J.L. performed all experiments, calculations, and data analysis. R.S. proposed the theoretical model and performed calculations. R.P. and W.-H.C. helped with the optical setup. K.T., G.K.S., W.-H.C., and R.S. performed ellipsometry measurements and analyzed the ellipsometry data. A.R.D. helped in discussion. Y.-J.L., R.S., and H.A.A. wrote the paper, and all authors discussed and revised the final manuscript. The authors declare no competing financial interests.

Attached Files

Published - s41467-017-01870-0.pdf

Supplemental Material - 41467_2017_1870_MOESM1_ESM.pdf

Supplemental Material - 41467_2017_1870_MOESM2_ESM.pdf


Files (7.0 MB)
Name Size Download all
1.3 MB Preview Download
2.3 MB Preview Download
3.3 MB Preview Download

Additional details

August 19, 2023
October 17, 2023